Chris Withers wrote:
...but which just gets the names of utilities available for a particular
interface.
The reason I ask is that getUtilitiesFor returns tuples of name and
utility. This seems wasteful, particular when the utilities need to be
created from factories,
Utilities are never created when they're looked up. They're created when
registered. Singletons (instances) are registered with the utility
registry, never factories.
and all I'm then doing with the list is
generating a drop-down for people to select from...
getUtilitiesFor is all we have. If you want that drop-down, consider
using UtilityVocabulary from zope.app.component.vocabulary, e.g.:
class FooUtilityNames(UtilityVocabulary):
interface = IFoo
nameOnly = True
classProvides(IVocabularyFactory)
Register that as a utility:
<utility component="...FooUtilityNames" name="Foo Utilities"/>
Then you can refer to it from a schema definition (Choice field).
Philipp
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